Winding machine



May 6, 1941. 1 M. mm

Q 1111mm lmcnnna I Filed Dec. 22. 1938- 7 sheets-sheet 1 INVENTOR.

May 6,1941] 1 KNAB 7 1 2,241,141

WINDING MACHINE Filed Dec. 22, 1938 7 Sheets-Sheet 2 IN VENTOR.

'MAX KNAB & ORNEYS May 6, 1941.-

M. KNAB WINDING MACHINE- Filed Dec. 22, 1938 7 Sheets-Sheet 5 INVENTOR. MAX KNAB May 6, 1941. 'KNAB 2,241,141

- WINDING MACHINE i Filed Dec. 22 1938 7 Sheets-Sheet 6 .ILE\.. 7.

MAX KNAB IN VENTOR.

. TORNEYS May 6, 1941. M. KNAB WINDING MACHINE Filed Dec.' 22,1938 7 Sheets-Sheet '1 INVENTOR MAX KNAB Patented. May c, 1941 Um-mo STATE- Max Knob.

Specialties ration of n. 1.. nonuto 00., hlortlr ndaml, Mala, a corpo- Application Mm a, rest, and no. we

The present invention relates to winding machines and more particularly to winding machines for mass production of coiled articles to be wound to a predetermined number of turns.

My invention will be described in connection with an embodiment thereof designed for the winding of electrical condenser but it should be well understood that my invention is not limited to the winding of condensers, and its various novel features are equally suitable for winding machines for magnet coils, resistors, etc, and other coiled articlea Electrieai condensers as a rule "comprise two conducting strips separated by interposed dielcctric strips. The conducting strips are usually metal foils, such as tin foil or aluminunrfoil. and the dielectric strips'are usually paper,- Cellophane or the like.

To wind a condenser the metal and dielectric strips are fed to a winding mandrel from socalled endless stock rolls, the strips are secured to the mandrel, the mandrel rotated manually or :by motor for a given number of turns, after which the strips are severed from the stock and the wound condenser roll removedfrom the mandrel. v V

The proper alignment ofthe' strips, the winding to the proper number of turns. and severance of the strips from-the stock require considerable skill from the operator. killed operators the speed of operation is limi ed and errors in the proper alignment and win to the proper number of 'turns are frequent because of the human element involved.

It has already been proposed-to obviate these shortcomings by providing machines with automatic features; however, the automatic and semi-automatic winding machines so farpro posed were complicated andfell short of their purpose.

My invention relates which altogether eliminates the human element as far as the speed and accuracy of winding are concerned, and permits thereby the winding of condensers at speeds and with anaccurac'y heretofore unachieved.

In the machine of my invention. 1 provide a winding head having two winding mandrels alternately placed in when the winding of a condenser roll has been completed on one of the mandrels, the second mandrel is. thrown into its winding position, and since the stock strips automatically jassume a proper relation. to this mandrel they can be facilely secured thereto without their wi ding position.-

iii. zit-58) special skill of the operator. of the strips of the condenser roll by means denser roll can be wound on the second mandrel during the winding of which the operator without loss of time removes the finished condenser roll from the first mandrel. The winding of the Upon severance from the stock condenser roll to the proper number of turns is and even with highly- 30 40 to a winding machine requiring 55 entirely automatic, requiring no attention of the operator whatsoever and can take place at very high speeds. In addition the device which controls the winding of the condenser roll to the exact, required number of turns is such as to permit a simple change-over of themachi'nefor the winding of condensers of a different number of turns from the one previously wound. V

Among the various specific features of the invention are also means to automatically, slow down the winding machine before it is brought to a stop upon completion of the winding of a condenser'roll.

Another -,novel. feature of'my'invention is a means to permit, e changeover from one winding mandrel to the her winding mandrel while maintaining the either one of the winding mandrels and the means which serve" to control-the number of turnstobewonndi I The various novel features'of my invention will; more clearly understood by referring to the drawings forming part of the specification, inwhicm V.

Figural is a front elevation of a condenser- ;nachine embodying the invention;

Fig. 2 is} sideelevation of the winding machineofFigJ; M

Fig. 315 a front-elevation of the automatic controimechanism. showing also the drive and clutch for supplying power 'to the winding mechanism:

Fig. 4 is a side elevation of the mechanism of Fig. 3:

Fig. 5 is a- -i'ront elevation'of the winding head mechanism and its associated parts; 5

Fig-.6 is a partly sectionized side elevation of the winding head along its shifting mechanism, parts not essential to 'venience of illustration;

Fig. "I'isatop viewof Fig.6; v lig. 8 is-a sectional view ofthe winding mandrelhead' Fig?!) is an enlarged sectional view of the f a semi automatic device, a conexact relative positionbetween line |--6 of Fig. 5 with the shifting-mechanism being omitted for con- 7 ably tween the two strips of metal foil.-

the spindles is a pulley 2 provided roller clutch of the winding head shownaiong line H of P18. 8.;

Fig. loisasideelevationofthewindinghead shifting mechanism; V -Fig. 11isatopviewofthecuttingknife.

Referring to the drawings, and more particularlytoFigs. 1-, 2, 3,and4,the windingmachine there shown comprises a bed-plate I. mos-ted by cast iron legs "-43 which are lllltally reinforced byapairofupperandapairoflcwer braces I3cI3a, the lower braces being alaoheld together by a transversal tie rod ll. 'lhe bedplatelll carriesaverticalfi'ame ll Ihlchisauitreinforced, and provided with a plurality of bored bosses 2lla serving as bushings for corresponding spindles Ii, adapted to carry stock rolls a-I, 11-2, etc.

In the drawings eight such spindles II are shown, corresponding to the eight stock rolls a-I to 0-3, of which ol and 0-! are metal foil rolls and the remainder paper rolls, the relative disposition of these rolls being such that in win in hree paper strips are'in becourse be understood that the lumber of metal foil and paper rolls depends on the actual type of condensers to be wound.

For proper alignment of their respective strips be later described-there are provided successively a plurality of rollers in the path of the strips. First the strips are passed over individual rotatable rollers 28, carried on spindles I98 supported from the frame Ii, and then over rotatable rollers 2 I, provided on spindles 226 supported in the frame Il,'these spindles being preferably arranged as a'banked unit.

It should of From the individual rollers 2I the strips pass to and between a common gathering roller pair the composite strip is fed' 23 and 24 from whic to the winding mandrel and wound a. manner later to be described.

The driving and automatic control mechanism is illustrated in its general arrangement and in detail in Figs. 1 to 4. A driving motor M suitably mounted underneath the bed-plate II trans mits power from a three-step pulley "I bymeans of a belt (00 to a power transmission mounted by means of a bracket 4 underneath the bed-plate Ill.

around it in The power transmission, as shown in detail in Figs. 3 and 4, comprises from the bracket 4. A three-step pulley I corresponding to the three-step pulley III of the motor and engaging with one of its steps the complementary step of the latter by means of belt Mill-is fixedly secured to the shaft 3. Loosely mounted on shaft 3 and free to rotate on same on its left face with a friction disc I5 adapted a shaft 3 supported theopboslngiaceofpulleylll. To pulley: extendsintoabnkedmm to cooperate with a shoe ll I. placement of the pulley 2 toward the I is prevented by a thnut hearing "I interposedbetwcen it andthebracket I.

The supporting and below the shaft clockwise by actuation of the foot presses against the end face of shaft 3, causing the latter's displacement towards the right, thereby engaging the pulley I with the clutch disc I.

Secured to the shaft Ill beyond the bracket 4 is an L-shaped arm I. which carries the brake shoe lII biased by a spring I3 and normally Dressing against the drum 2.

When by actuation of the foot pedal I by the operator the shaft 4" is swung in a clockwise direction. engagement of the clutch disc II and releasing of the brake II from the brake drum I2 causes the pulley 402 to rotate in unison with pulley I.

Rotation of pulley 2 in turn produces rotation of a winding shaft IIII of the winding machine through the coupling ail'orded by a belt 410 and a pulley Ill on the shaft SII.

Shaft I is carried at one end within a split bearing consisting of an upper portion 652 and a lower portion Gil secured to a pedestal Oil mounted on the bed-plate It. The other end of within a bushing ill of the frame II in a manner later to be more fully described.

The control mechanism for the winding machine and the members connecting it with the winding shaft III are shown in detail in Figs. 3 and 4.

Disposed on the winding shaft ill, adjacent to the pulley ill is a driver gear "2. Supported from the bearing portion "2 by a bracket III and disposed on the shaft SII adjacent to the gear 502, is an adjustable idler gear arm Ill through .a bushing III of which passes a bolt SII carrying a freely rotatable idler gear I secured in position by locking nuts 5I2-5I2 engaging the threaded end of bolt 5| I.

The gear arm "9 is provided with a circular adjustment slot 5 through which passes a bolt H3 threadedly engaging the bracket IIS.

A change gear 505 carried by a spindle shaft SIG is secured to this shaft by a nut ill. The change gear II! is easily removable andserves I as the adjustment means for the control mechaproper engagement of the the idler gear Sill is correspondingly located by alongthe slot III which toformaclutchwith'75 nism of the winding machine. Thus in winding condensers of a greater or lesser number-of turns a gear 505 having a correspondingly greater or lesser number of teeth is used. To provide for gears 502, ill and 505,

shifting of the arm I! is then locked in position by the bolt SIS.

Also carried by the shaft 508 is a' worm ill which engages a worm gear lit disposed on a the axis of which is perpendicular to Worm gears Ill and II. are enclosed in a statue"atrium m I! supported by the complete revolution when the condenser follower I carried I push-rod 531 as mounted on a hollow base tends therefrom and portion with a cm The gear ratios of .the gears and worms above referred to are preferably so selected that the number of teeth of the change gear III .is equal to the number of the turns of the condenser to be wound, and that the cam Iii makes one iswound to its required number of turns.

The camtfl cooperating with a beveled camby a push-rod Ill, is so and gradually depress the III is about to complete suddenly disengage the is provided on its extending shaped as to eng e. push-rod "1 as the cam its revolution, and to tion after completion of its revolution. Pushrod 581 properly guided extends with its lower threaded end 40 below the bed plate I and a'djustably carries thereon a stirrup ill.

In its upward motion the push-rod 501 is limited by a collar "0 abutting against the bottom of the hollow base 520. I

The stirrup I engages by means of a pivot pin 2 a lever I" which upon downward movement of the push-rod 531 is subjected to a limited clockwise displacement about a fulcrum piv- 0t 5 supported from an arm Ni projecting downwardly from the base 520.

ill fixedly secured thereto.-

twee

when the gear m is rotated counterclockwise. bed-plate u. -'1he shaft If! suitably supp rted by'the housing III exa To release the pinilll when the gear the cam assumes its zero posi- I no t of --the clutch takes place and sleeye 000 maintains its last'assumed position.

To. provide a dental ratition of'the sleeve 0", the inner face of pinion gear I is provided with two diametrically di e slots 000-409. (see Figs. '7 and 8), and depending on the position of the pinion gear Ill-one of the two slots '09 is engaged by apin Oil carriedby a bent arm 0 loosely pivoted at ll! and'adjustably pivoted at 6 l l.

600 is to be rotated; the arm I l, is displaced by actuation of aball l5 carried by a rod BIS as later to be more fully described.

v To rotate the pinion gear B00, there is provided a rack "I carried by a frame 020. The frame 0204s adjustably bolted to the bed-plate I0 and is provided with a rectangular groove "I in which rides the rack 60L Rack 60! is furthermore guided in a guide block 625 secured to the frame 010 which also carries a bracket 8|! to support the rod Git.

- engages one end in a bracket "0 In its portion extending to the left of the pivot upwardly through the bed-plate l0 and with its umier end engaging a threaded rod- IIS carried fien 000,

from the base 526 by a bent bracket in acts Y to bias the lever 543 in a counter-clockwise position. The spring 552 is adjustably tensioned by means of two nuts 554 each provided on opposite sides of the bracket "ion the rod "I. Spring 552 is locked in its adjusted position by a set screw 556.

Disposed between the split bearing comprising portions Oil and 652 and the bushing 001 is a mandrel head rctator mechanism shown in greater detail in Figs. 5, 6, 7,8 and 10.

. It comprises a mandrel head rotating sleeve. 0 extending from both sides of the bushing 001, concentrically surrounding the shaft "I and later to be referred sleeve 000 fixedly carries on its portion extending to the right-of the bushing 601 a cylindrical clutch disc 602 which in turn is concentrically surrounded by a pinion gear 600.

The clutch disc '02, as shown in Fig. 10 is provided with three symmetrically spaced recesses 003 each having a short radial side 00 and a longer side 60! perpendicular to '00. Within each recess is provided a roller 004 having a diameter slightly less than the depth of the short side "I, the roller 004 contacting along the inside surface'of the pinion gear 000. Between the roller 604 and the short side I is provided a tensioned leaf-spring 062. The clutch disc '01 is thereby arranged in free-wheeling engagement to in greater detail. The Y clutch, as shown in ever, 7 and III sleeve 60B with three longitudinal recesses To operate the mandrel rotator there is provided, as shown in Figs. 1 and 2, a foot lever 630 fulcrumed at 0.3!, and

of alever 635 fulcrumed at 031 extending from the bottom of the bed-plate I0. m are successively secured the end of the rod iltandtheendoftherack 60L To provide a delay in the operation of the rack 00! with respect to rod 016 and thus permit rod M0 to disengage the locking pin 6 l 0 from the slot 000, before the rack l starts rotation of pin; the end of rack 60I instead of directly engaging lever 035,-. engages a rectangular slot 0 thereof by means of a pin 5. I

Actuation of the rack GM, as previously described :causes rotation of the mandrel rotator which rotation brings into winding position one orthe other of two winding mandrels and I04 contained in a winding head mechanism.

The mandrel head mechanism is shown in Figs. 5, 'l and 8, and particularly in Fig. 8. As shown in Fig. 8, a winding head I00 is carried on themandrel head rotating sleeve 606, for example, by a forced fit being provided between sleeve 008 and a bushing I80 of head I00.

The winding head I00 comprises for each of the winding mandrels I03 and 104 a set of parts whichincludes respectively, driven gears "I and I02 and coupling means between these gears and their respective mandrels, to be later more fully described.

agear I05 adapted to be coupled to the winding shaft 50l through its sleeve I08 serves to rotate the gears IM and I02 respectively.

Engagement of the sleeve 100 takes place by means of afreewheeling Fig. 9. The shaft 50! is provided in its portion surrounded by sleeve I08 I06 in which are I01 and springs IBI, similar to in connection with the clutch of Lateral displacedisp sed rollers those described the mandrel head actuator.

ment of gear 105 is prevented by a screw I20 threaded into the end of shaft 50 I Disposed between sleeve 109 and the mandrel head rotating sleeve 606 is a bushing I08, but if the sleeve 008 is of bearing materialbushing I00 may be omitted. v

The driven gear with integral cylindrical extending sleevesm and m are provided m positive lock and prevent acci- V carrying a link are which Y On the other end of the lever winding shaft 5M with the.

respectively,'which at their free end are shaft :20 in its extended position.

provided with ratchet-like teeth HI adapted to cooperate with corresponding teeth III of mandrel-spindle releases "4.

Each of the mandrel spindle releases "4 is provided with two diametrically-disposed extension fingers 1 l5, which serve to disenzafle each of the spindle releases H4 from its cooperating sleeves H and Ill respectively. To engage their respective mandrels III and 104 the spindle releases "4 are each provided with a square protruding portion H0 enga ng a corresponding square slot H0 of a mandrel holder lll each of which fixedly carries at its opposite end its respective winding mandrel III or III. A coil spring I20 tensioned between an inward shoulder 100 of holder Ill and the head of ascrew "0 secured in portion H0 tends to engage the respective teeth of the mandrel releases "4 and sleeves H0 and II I.

Surrounding the sleeve land secured to bushing m is an annular ring cam m.

At its uppermost portion the cam III is provided with a circular recess 104 which allows free rotation of the upper mandrel spindle release fingers "5. Beyond the recess 104 the periphery of the cam 130 is offset to provide a section III which by engaging the fingers Hi, i. e. of the lower release spindle ll disenga es the ratchetteeth "2 and Ill.

The mandrel tail stock assembly of the windingmachine is shown in detail in Figs. 5,. 'l-and 11. It comprises a tail stock 000 secured to the bed-platell by a bracket 8l0, a bored knife retaining shaft 802 slotted at 0-", and a spindle retaining block 80| fixedly secured to the shaft 800 is provided with two offset The tail stock portions M3 and 8 the latter of which is adapt-;

ed to loosely receive one end of the shaft 002.

The other end of the shaft 002 is fixedly secured to the winding head 100 by a flange coupling 0". Disposed within the bore of the shaft"! isa knife activating shaft 020 and within the slot II! are two knife blades Oil-02L each of which is provided with two diagonal slots 022 and 02! diverging toward the cutting edge of the blades. A pin 0|! loosely passing through the slots 02! and fixedly held in the shaft 002 secures the blades "I at one end within the shaft002.

The other end of the blades "I are disposed within a slot 823 at one end of the shaft 020 and are loosely held therein by a pin I24 passing through the slots 82! and secured in shaft 820;

At its other end the shaft 020 extends beyond the shaft 002- and is provided with .a knob 020 A spring 020 disposed between the knob 020 and the end of the shaft 002 serves to maintain the The spindle retaining block III is provided with two diametrically-disposed mandrel retainer bushings 003 fixedly secured thereto.

Disposed within each bushing 003 as a sliding fit is the mandrel retainer 004, each preferably provided with a collar "I to limit motion to the left.

The operation of the mechanism of the invention is as follows:

A change gear 505, the number of teeth of which, in the simplest arrangement, corresponds to the number of turns of the condenser to be wound, is placed on shaft 500 and-the idler gear bracket 500 with the idler gear 504 is accordingly adjusted to bring ears 502, I04 and!" in proper engagement. The condenser stock, for instance, two layers of metal foil with three layers of paper brakeshoe disenga ed until 505, ill and II, the

from pulley 402,

' m and of the interposed, are placed in alignment between the two halves of that mandrel which assumes the top position and the mandrel retainer 004 moved to the extreme right to engage and hold the mandrel.

with the motor running, the clutch pedal 40! is depressed. Depressing this pedal actuates the clutch rod 400 which in turn causes the wedge block 401 to move to the right the shaft 403 carrying with it the stepped pulley 40!. The sidewise motion of the pulley 40! brings it in frictional contact with pulley 402 which couples the driving motor through pulleys 40l, 402 and belt 410 to the pulley 500 and to the mandrel I03, as will be later more fully explained.

Movement of the rod 400 through angular displacement of the shaft 408 disengages the brake 4 from the brake drum 2 and also causes the arm 041 to engage the recess 540 of the link arm 543; the arm 541 thereby retaining the shaft 400 in its displaced position so that after the operator removes his foot from the pedal 405 the pedal remains depressed, the clutch engaged and the the automatic stop comes into operation.

The power transmitted to pulley 500 and to the winding shaft 5, rotates the winding mandrel 103 through the intermediary of the roller clutch enclosed in the gear sleeve 109, gears I05 and III, the engaged mandrel release H4, and mandrel spindle H1. The rotation of mandrel 104 is prevented by the engagement of the fingers ll! of its associated mandrel spindle release 'H 4 with the offset portion 13l of cam I30.

Concurrent with the rotation of mandrel 103 the shaft ill causes through the gears 502, 504,

rotation of the cam 52L A full rotation of cam 52l causes through actuation of push-rod 531 and link arm 543, the arm 541 to trip. This disengages pulley 4M and releases thebrakeshoe 4| I, thereby stopping the. winding machine.

In practice I prefer to gradually decelerate the machine before removing the power and applying the brake. This I accomplish by placing on the machine agdrag or excess load when the cam ill is about to complete its revolution. This is efiected by a stretching of the coil spring 552 by the lever 543 with the downward movement of the cam push-rod 531.

the just wound condenser, the operator actuates the foot lever 630. This causes, tion of rod iii and rack 60l, rotate by 180.

Rotation of gear ill nclosed clutch through actuathe gear 800 to brings about through its a corresponding rotation of sleeve entire mandrel head 100. This shifts the mandrel 103 to the lower position and mandrel 104 to the upper position. During this rotation the fingers "5 of the mandrel I03 enof mandrel III are and are carried As a result thereof, the mandrel 104' I03 remains still.

inwardly by the spring I20. upon rotation of shaft ill, will not rotate, and mandrel The free-wheeling clutch disposed within the .prior to the engagement of the fingers "5 of "new position, the rack "I lrnife retainer shaft "2 and tion to thestoclr the slot lilof the former in the condenser vlously described.

tion of the winding shaft and cam and stopping'means.

--the desired a a winding head, two you saidwinding he -'cam in positive said. winding shaft,

the upper mandrel'lll by the offset portion III winding head III! has assumed its the foot pedal I is and the rod!" return the free-wheeling rotator clutch preventing the When the to their normal-position; drel head -man winding head 1!. from returning toits former .position as previously described.

head also rotates the the tail stock block 'Rotation of the winding Ill.

when the wound condenser section is carried to bottom position by the mandrel 103 the metal and paper foils leading from the condenser secrolls come to rest on the knife the mandrel 104 with contact with the foils. Before severing the condenser from the stock the foils are secured I inserting its cupped portion 1040. After this the foils are severed at their portion between roll and mandrel 1M, operator actuating the ball 816, which causes the knife blades 82! to forcefully project from the slot ill of the shaft "2. The use ,of two blades "I causes severance of the foil irrespective of which of its two positions the knife retainer shaft assumes.

The machine is now ready for the winding of another condenser of the same type, and is wound by depressing the foot pedal 40!, as pre- During the winding of the second condenserthe operator removes the condenser from mandrel 103. I In case a condenser of a different number of turns is .to be wound, it is only necessary to change gear 5'5 and correspondingly adjust gear arm "9. Y

In case different stock is used for the condensers, changes are made in conventional manner. f

While I have described my invention with regard to a specific embodiment and in a specific wish to be limited thereto but retainer shaft ll! and broadly as pe What I claim is: 1. An automatic winding plurality of winding mandrels windinghead, a winding shaft, and a cam in positive mechanical engagement with said shaft,gmeans successively place the mandrels in winding position and to connect with the winding shaft which isplaced in winding posithe identical rotary position drel is brought into winding position. posed within the winding head to means disby the winding head during its rotation, for the winding shaft actuated by said cam when number of revolutions of. the .winding shaft have taken place, and means actuated by said cam to decelerate. said shaft prior to the actuation of the stopping means.

2. An automatic winding machine comprising a winding shaft, and a mechanical engagement with means to rotate said head and successively place the mandrels in winding position and means associated with the manaction of theby the first machine comprisin winding mandrels disposed released and Q a winding shaft, a

means associated with each mandrel to insure that the mandrel assume about its axis each time the manprevent rotashaft before the shaft, means the identical time the mandrel is brought rotary position about its axis each actuated by said cam when the of revolutions of the winding shaft have taken place, and means actuated by said cam to decelerate said shaft prior to the actuation of the stoppin means.

3. An automatic winding machine comprising a winding head, a winding shaft, two winding mandrels diametrically disposed on said winding head and adapted to receive winding stock, and a cam in positive mechanical engagement with said winding shaft, means to rotate said winding head and successively place the mandrels in winding position and to connect with the winding shaft the mandrel which is placed in winding position, means associated with the mandrels to prevent rotation of the winding shaft by the winding head during its rotation and while moving into position the winding mandrels, stopping means for the winding shaft, said cam rotated by said winding shaft and actuating said stopping means when the desired number of revolutions of the winding shaft have taken place, a normally inactive stock cutting means disposed within a slotted shaft centrally disposed on said winding head between said coming to rest on said slotted shaft upon rotation of said winding head, and means disposed in said slotted shaft for actuating said stock cutting means.

4. An automatic winding machine comprising driving motor, and a clutch interposed between said motor andsaid winding shaft, an automatic control mechanism for said winding shaft comprising a lever adapted to maintain said clutch in its engaged position, a cam which is rotated by said shaft and actuates said lever to effect the release of said clutch when the desired number of revolutions of the winding shaft have taken place, and a normally inactive drag actuated by said cam and adapted to decelerate said'winding shaft prior to the release of said clutch-by said lever.

5. An automatic winding a winding shaft, a driving motor, a-clutch interposed between said motor and said shaft, and an automatic control mechanism, said mechanism comprising, a member aillxed to said lever and serving as a normally inactive drag on said shaft, saidlever adapted tomaintain said clutch in its engaged position, said cam rotated bysaid shaft adapted to actuate said, lever. to effect release of said clutch and to actuate said drag by distorting said spring member.

6. In a high speed winding machine comprising a winding shaft and an automatic stopping mechanism forsaid shaft, means to decelerate said stopping thereof, said means comprising a normally inactive drag comprising a spring member and a cam rotated by said shaft adapted todistort said spring member.

'7. A winding machine comprising a winding head, a winding shaft, two winding mandrels diametrically disposed on said winding'head, a cam and automatic stopping mechanism for said to alternately place said mandrels in winding position, means associated with each of during its rotation, said means insuring that the mandrel assume into winding position, and stopping means for the winding shaft Q desired number machine comprising cam, a lever, and a-spring said rn'andrels to connect the positioned mandrel diametrically disposed in said winding head" with said winding shaft and means to prevent means to rotate said winding'head and slice: rotation 01 said shai't while moving into position sively place said mandrel into winding position the winding mandrel. sai cam rotated by said and means disposed in said Windinghead to preshaft and actuating said stopping means when a 5 vent rotation of said mandrels with respect to desired number of revolutions oi the shaft have said winding head during its rotation, said means taken place. 7 comprising a free-wheeling clutch in erposed be- 8. A winding machine comprising a winding tween said winding shaitiand said mandrels. head, two winding mandrels disposed on said 10. In a winding machine a winding shaft, a winding head, and a winding shaft. means to rol0 winding head carrying two diametrically tate said head and successively place the mandrel; winding mandrels, means to selectively engage in winding position, means associated with said and gage said mandrels from the shaft said mandrels to disconnect the mandrels from the means comp ng a releasing and locking memwinding shaft and to fixedly lock the mandrels her for each of said mandrels and a cam i with respect 'to the winding head during its ro- 15 about the shaft, means to rotate the head and drel assume an identical rotary position about said cam to lock its ssociate mandrel, and its axis each time the mandrel is brought into cause disengagement of said cam from the other I member to permit engagement of the other man- '9. In a winding machine comprising, a winding 20 (Ire! with said shaft. head, a winding shaft, two winding mandrels MAX KNAB. 

